docs: def vhatg(v1, ndim):
      """
      Find the unit vector along a double precision vector of arbitrary dimension.
  
      http://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/vhatg_c.html
  
      :param v1: Vector to be normalized. 
      :type v1: list[ndim]
      :param ndim: Dimension of v1 (and also vout). 
      :type ndim: int
      :return: Unit vector v / abs(v).
      :rtype: list[ndim]
      """
      v1 = stypes.toDoubleVector(v1)
      vout = stypes.emptyDoubleVector(ndim)
      ndim = ctypes.c_int(ndim)
      libspice.vhatg_c(v1, ndim, vout)
      return stypes.cVectorToPython(vout)